William beight tubmax



(No M0581.)

W. TUBMAN. I VALVE GEAR Eon STEAM ENGINES. No, 283,538. Patented Aug.21, 1883.

WITNESSES: INVENTOR: W0? fiFC/QV Q I W (flown-M6) ATTORNEYS;

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a Nudg UNITED STATES PATENT OFFICE.

WILLIAM BRIG-HT TUBMAN, OF VALDRON, ARKANSAS. V

VALVE-GEAR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 283,538, dated August21, 1883.

Application filed December 1, 18F2. (No, model.)

To (til whom it may concern.-

Be it known that 1, WILLIAM, B. Tennis, of YValdron, in the county ofScott and State of Arkansas, have invented a new and Im proved ValveGear for Steam Engines, of which the following is a full, clear, andexact description. 7 i

My invention consists in valve gear for stea-nrengines constructed toallow of convenient reversal of the engine and regulating the supply ofsteam, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming-a part ofthis specification,in which similar letters of reference indicatecorresponding parts in allthe figures.

, Figure 1 is a side elevation of my improved valve-gearing. Fig. 2 is aplanviewof the same. Fig. 3 is across-section on line m, Fig. 2: Fig. 4183 cross'section on line 3 11,

A represents one side of the bed-plate of an engine. 7

13 are slideways lived at one end of the bed plate, and fitted with twocam or eccentric rods, 0.

-D is a connecting-rod, sustained atits end between the eccentric-rods Gby a bracket, m, and also formed with two arms orwristpins, a a,forengaging notches I), formed in the rods 0.

E is a sleeve fitted on the rod D between brackets d d, and providedwith a handle or lever, c, for turning the sleeve, and also the rod D,which is formedsquare, and passes through a square aperture in thesleeve, so

that it'is free to move cndwise, and at the same time can be turned bythe sleeve.

F is a slide fitted at the side of the. rod D, and parallel thereto, andformed with abracket or projection, f, to which the end of the rodD 5over G the stem of the engine-valve will be jointed, illustrated bydotted linesin Fig. 1.

L is a curved plate secured to the bed-plate A, and ext-ending over therod D and cam-rods G C, so as to prevent the disconnection of the pins aafrom the notches Z) of the rods when the valve is in the position forcushioning the piston. v

The main shaft of the engine is to be provided with-two cams oreccentrics placed for operating upon the eccentric-rods G, and so setthat one cam will move the valve for driving the engine in one directionand the other for driving the engine in the opposite direction.

By turning the rod D, one of its arms a is en gaged with one of thecam-rods C, so that the rod D will be moved endwise with the movement ofthe rod G by the eccentric, and that in turn giving movement to theslide F, the

lever G will be rocked and the valve operated.

To reverse the engine, the rod D is to be turned by means of the lever eand sleeve E,

thereby disengaging the Ellllllt from the rod C at one side and engagingthe other arm with the red at the other side. To stop the engine, thesleeve E is to be operated to bring the rod D to the middle positionwith both arms (6 disengaged. By movement of the lever O the slide H 'israised and lowered, thereby shifting the fulcrum-stud T of the lever G,and the amount of steam admitted to the engine cylinder is thusregulated.

The rod D may be connected to the valvestem directly, instead of usingtheintermediate slide, F, and lever, as shown, but in place of themusing a small cross-head or slide, to which the valve-stem and the rod Dare both connected.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A valve-gear for steam-engines, consisting of theslide-rod D, provided with arms a a,

e and fitted for being rocked sidewise, the sliderods 0 0, provided withnotches I), and fitted for movement by cams or eccentrics upon the j I283,538 I In valve-gearing, the combination of the 6. In valve-gearing,the combination, with eccentric-rods C O, the slide-rodl), provided theslide F of the rod D, that isoperated by with arms a a, the slide F, andthe lever G, the eccentrics, of the adjustable slide H, ful- 15substantially as shown and described. 'crum-stud T, and lever G,substantially as 5 4. The combination, with the bed-plate A, shown anddescribed.

the. notched eccentric-rods O, and the sliding rods D, provided With thearms a, of the curved WILLIAM BRIGHT TUBMAN.

7, plate L, substantially as described.

5. In valve-gearing, the combination, with Vitnesses:

IO the slide-rod D, of the sleeve E, the brackets \V. J. KING,

d, and the lever e, as and for the purpose speci- E. O. XVHITINGToN.fied.

